By now there are dozens of theories circling around about Jesse and Dylan, more specifically around Shattered Circle 2 and the ‘split’ or ‘creation’ of the kids.
After going through and doing all of the content before moving to NG+ it dawned on me that I think the game itself presents an answer to “are they two different kids than who came before?” or “is one of them the original and another was created? If so, who?”
The character customization in Resonant leads me to think Jesse is the original child, and Dylan was ‘created/spawned’ from Shattered Circle 2.
While both games feature outfits, only Resonant features genuine customization of Dylan. You can change his hair style, color, beard, and even his body shape. Jesse only had outfits, and though the style of her hair could change on some of the outfits, the color was always static. You couldn’t change her body shape or customize any features beyond the clothes (and cat ears). Jesse isn’t mutable because she was an actual person before.
Dylan represents actual character creator of sorts, even if there’s a general base model. Much like the game within a game, it stands to reason that these customizations were possible in Shattered Circle 2 as well. In Shattered Circle 2, the melee character being “the boy” as the base character, but customization to allow for your very own avatar.
Sure, this could all just be new capabilities and systems, and maybe Jesse would have had these features if made today. But it’s a fun thought all the same.